400 mm), and high fertility. The semi-suitable and non-suitable regions were located in the central to north of Aq-Qala township. In this areas, the limitation factors were include: low precipitation, some soil variables such as: high pH and salinity, non-suitable texture classes, high potassium and calcium contents, low phosphate, iron, and organic matter) and non-suitable and slope aspects.]]>400 kg N ha-1 with 0.72 PO4 equiv./t tuber and 1.80 NOx equiv./t tuber, respectively. The highest global warming potential was calculated 948.87 CO2 equiv./t tuber for 350-400 kg N ha-1. The maximum Eco-Index were computed for >400 kg N ha-1 with 0.37 Eco-x per one tonne tuber. The highest values for impact categories such as aquatic eutrophication, terrestrial eutrophication and acidification were calculated for >400 kg N ha-1 with 0.29, 0.015 and 0.012 Eco-x per one tonne tuber, respectively.]]>